Made from black oil leather approximately 1.5mm thick. The surface is lightly waxed, giving it a soft, supple, and pleasant feel. The entire perimeter is hand-stitched with black thread. The size when open is 22.5 cm x 33 cm. It can be used for notebooks, journals, or books up to about 2 cm thick. Images 1, 2, 3, and 4 show it being used with a 2 cm thick book. As shown in images 5 and 6, there are pockets on the left and right inside for cards and business cards, a pocket on the left for memo paper, a pocket on the right for a ruler, and a bookmark in the center. Because it is vegetable-tanned leather, the depth of character will increase with use, allowing you to enjoy the aging process. Please also enjoy the feel of the oil leather. The book, cards, memo paper, and ruler in the images are not included. As natural materials are used, there may be scratches, wrinkles, and color unevenness. Thank you for your understanding of handmade products.